Oswalt will take on the role of Jonas Pfeiffer, the new VP of human resources at Atlantis Cable News. DeWitt will play Rebecca Halliday, a lawyer defending Atlantis in a lawsuit.

The premiere date of Season 2 has yet to be set by the network, though production on its sophomore outing begins next week.

Created by Aaron Sorkin (Oscar(R) winner for writing "The Social Network," executive producer and writer of the multiple Emmy(R) winner "The West Wing"), the newHBO drama series follows a news team on its quixotic mission to reclaim the legacy of Murrow and Cronkite in the face of a fickle audience, corporate mandates and tangled personal relationships.

The series is executive produced by Sorkin, Scott Rudin (the Oscar(R) winner "No Country for Old Men") and Alan Poul (HBO's multiple Emmy(R) winner "Six Feet Under"). Jeff Daniels (Golden Globe nominee for "The Squid and the Whale," "Something Wild" and "The Purple Rose of Cairo") stars as Will McAvoy andEmily Mortimer ("Hugo," "Shutter Island") stars as MacKenzie McHale.